			*{padding:0;margin: 0}
			.shake_box {
				background: url(../weixin/images/xiaolian.png) no-repeat #1e2020 center center;
				position: fixed;
				top : 0;
				left: 0;
				width  : 100%;
				height : 100%;
			}
			.shakTop,.shakBottom {
				background: #FEFEFE;
				position : fixed;
				left  : 0;
				width : 100%;
				height: 50%;
			}
			.shakTop    {top    : 0;}
			.shakBottom {bottom : 0;}
			
			.shakTop span,.shakBottom span{
				background:url(../weixin/images/shakBox.png) no-repeat;
				position: absolute;
			    width: 100%;
			    height: 200%;
			    margin: 0px 0px 0px 0px;
				background-size:100% 100%;	
/* 				background-size:cover;		 */
			}
			.shakTop    span{bottom : -1px;}
			.shakBottom span{
				top : 0;
			}

			.shake_box_focus .shakTop{
				animation        : shakTop 0.5s 1 linear;
				-moz-animation   : shakTop 0.5s 1 linear;
				-webkit-animation: shakTop 0.5s 1 linear;
				-ms-animation    : shakTop 0.5s 1 linear;
				-o-animation     : shakTop 0.5s 1 linear;
			}
			.shake_box_focus .shakBottom{
				animation        : shakBottom 0.5s 1 linear;
				-moz-animation   : shakBottom 0.5s 1 linear;
				-webkit-animation: shakBottom 0.5s 1 linear;
				-ms-animation    : shakBottom 0.5s 1 linear;
				-o-animation     : shakBottom 0.5s 1 linear;
			}

			/* 向上拉动画效果 */
			@-webkit-keyframes shakTop   {
				0%   {top: 0;}
				50%  {top: -100px;}
				100% {top: 0;}
			}
			@-moz-keyframes shakTop      {
				0%   {top: 0;}
				50%  {top: -100px;}
				100% {top: 0;}
			}
			@-ms-keyframes shakTop       {
				0%   {top: 0;}
				50%  {top: -100px;}
				100% {top: 0;}
			}
			@-o-keyframes shakTop        { 
				0%   {top: 0;}
				50%  {top: -100px;}
				100% {top: 0;}
			}
			
			/* 向下拉动画效果 */
			@-webkit-keyframes shakBottom   {
				0%   {bottom: 0;}
				50%  {bottom: -100px;}
				100% {bottom: 0;}
			}
			@-moz-keyframes shakBottom      {
				0%   {bottom: 0;}
				50%  {bottom: -100px;}
				100% {bottom: 0;}
			}
			@-ms-keyframes shakBottom       {
				0%   {bottom: 0;}
				50%  {bottom: -100px;}
				100% {bottom: 0;}
			}
			@-o-keyframes shakBottom        { 
				0%   {bottom: 0;}
				50%  {bottom: -100px;}
				100% {bottom: 0;}			
			}